Radiohead seems to be pointing to a 20th-anniversary release of their classic album OK Computer, but they are doing it in a very cryptic way.

Last week, posters started showing up in major cities like New York, Los Angeles, London, Berlin and Amsterdam that have had a number of clues according to fans of the band including the dates 1997-2017 (the album was released in 1997), lyrics in the style of the song Fitter Happier from the album and a presentation akin to the art from the album.

Radiohead has given their fans one of the most unique musical "Easter eggs" the world has ever seen. Gizmodo reports that certain fans recently discovered the band hid a vintage computer program on the tape that comes with the 20th anniversary edition of OK Computer.

The deluxe box set edition of the OKNOTOK reissue contains a "C90 cassette mixtape compiled by the band, taken from OK Computer session archives and demo tapes."